PO.DCA.Duong.WFit Function

Description:

Weighted fit of Duong decline to rate-time data and return parameters as a row array [q1, qInf, a, m].

Excel Function Syntax:

=PO.DCA.Duong.WFit(times, rates, weights)

Parameters:

Parameter	Description
times	Time samples (range or array).
rates	Observed rates (range or array).
weights	Per-sample weights (range or array), same length as inputs.

Related Functions

PO.DCA.AKB.D

Calculates instantaneous decline rate D(t) for Ansah-Knowles-Buba (2000) decline, [1/T]. Computed numerically.

PO.DCA.AKB.EUR

Estimated Ultimate Recovery (EUR) to an economic rate limit for Ansah-Knowles-Buba (2000) decline, [L3]. Returns cumulative production up to the time the rate reaches the economic limit.

PO.DCA.AKB.Fit

Fit Ansah-Knowles-Buba (2000) decline to rate-time data and return parameters as a row array [Qi, Alpha, Beta].

PO.DCA.AKB.Prod

Calculates cumulative production using Ansah-Knowles-Buba (2000) semi-analytical decline model for bounded reservoirs. Units of volume [L3] and time [T] must be consistent.

PO.DCA.AKB.Rate

Calculates production rate using Ansah-Knowles-Buba (2000) semi-analytical decline model for bounded reservoirs. Units of volume [L3] and time [T] must be consistent.

PO.DCA.AKB.Time

Time to reach an economic rate limit for Ansah-Knowles-Buba (2000) decline, [T]. Returns the time when the production rate falls to the specified economic limit.

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